Staybolt structure



l. R. FLANNERY AND E. l. DODDS.

STAYBOLT STRUCTURE.

En EPT 1o 191 APPL A 9. A 1,346,645. Patented July 13, 1920.

UNITED' JOHN noennsiigniiinnnx `A418111) ETHAN I. nonne, ori-,.rrirsnunen, .Pnitirsrr.verifie,`

AssIGNoRs 'ro FLANNERYA nomi. .coivrPA To aZZ whom t may concern:

Beit known that We, JOHN RoGERs FLAN- NERY and ETHAN I. DoDDs, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State 0f Pennsylvania, have invented certain new and useful Improvements in Staybolt Structures; and we do hereby declare they following to be a full, clear, and exact description of the invention, 'such as will enable others skilled in the artv to which it appertains to make and use the same. j

This invention relates to improvements in staybolt structures for boilers, and more particularly to that type in which the head Vof the staybolt is seated in an opening` in the boiler sheet and inclosed by a cap or closure,-one object of the present invention being to provide, in such a staybolt structure, a yielding cap or closure which shall surround the bolt opening in the boilerl sheet and inclose vthe projecting portion of the head of a staybolt having a tell-tale hole which extends from the inner end of the bolt and terminates within the head thereof, said flexible cap or closure being welded to the outer boiler sheet and having a part which lies over and in contact with the head of the bolt so that said cap or closure will normally tend to retain the staybolt head on its seat but permit longitudinal play of the staybolt.

vVith this and other objects in view, the inventionrconsists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

The accompanying drawing is asectional View, partly in elevation, showing an Vembodimentof our invention. Y

l represents an outer boiler sheet and 2 the inner sheet of a boiler.

The outer boiler sheet is providedwith an opening 3, a portion of the wall of which has a general tapering shape and formed with a transversely curved or rounded seat 4 for the rounded head 5 at' the outer end of a staybolt 6. The inner end of the staybolt may be threaded as at 7 and passed through a hole in the inner boiler sheet 2 and the inner end of the bolt -may be upset as at 8.

The rounded head 5 of the staybolt projects outwardly beyond the plane of the I s rxyorm STRUCTURE.

Nor,r1r rsi3nnen, PENNSYLVANIA. E

speeifieetieii of Leitersraieii'e.V Patented July 13, 1920. Application filed septeiiiber 1o, V1919. serial m1322573. f i

outer face of. the outer-boiler sheet l and is l inclosedby a cap or closure 9 whichsurrounds but is spacedfrom the opening in boiler sheet l. Y Y

The cap or closure is made of spring metal l with a peripheral wall l() which may be seated on the boiler sheet and bedisposed at approximately right angles thereto, and the spring or yielding cap or closure is made with a ,depressed part ll having a central curvedV portion l2 which overlies and en- 65 gages the outer end of the bolt head so that `when the cap or closure is secured to the boiler sheet, it will tend normally to press the bolt 'head against its seat and permit longitudinal play ei the ben. v

The capor closure 9 is permanently united tothe outer boiler sheet by a weld 13 surrounding tlie edge of the wall l0 of said cap orclosure.

It will be observed that the cap orclosure l 9 permanently incloses the bolt head and is permanently secured to the boiler sheety around the opening therein, and it is de-l sirable, for testing purposes, that the bolt be provided with a tell-tale hole which shall v be accessible from theinner end thereof..V We therefore provide the staybolt with a ,j tell-tale hole 14 which extends from the innernend of the bolt and terminates at'its outer end in the bolt head 5.

Having fully described our invention, what we claim as new and desire to secure by Letters-Patent, is :-k A

l. In staybolt structure, the combinar' tion with a boiler sheet having an opening, 9o and a staybolt having a head mounted in said opening, of a spring cap or closure Se-h cured to the boiler sheet and extending over and inclosing the bolt head, said cap or elo- Y sure having a central part bearing on Vsaid bolt head. n e

2. In a staybolt structure, the combination` with a boiler sheet having an opening, and

i a staybolt having a head mounted in said ing within the headed outer end of saidtboltg specification in the presence( of f .two suba spring cap surrounding the opening 1n the scl'lbing Witnesses.

boiler sheet and Welded to the latter, Said JOHN ROGERS FLANNERY. spring cap having a central depressed part 'l Erl-HAN 'Ii DQBDS. f provided. With a portion bearingon thehead4 W'itnesses: y 'Y 1- V of the staybolt. JAMES R. HORAN,

In testimony whereof We have signed this EDWIN S. RYCE. 

